once a cheater and liar always a liar

my husband cheated and lied about it and the baby it created for two years before i found out by researching it on my own. the baby even has his last name. He still lies to me about things and i only have to deal with him still because we have 2 kids together that were both here before the other but our youngest is only a year older than the cheaters baby...and it really sucks to know that I will have to put up with his lies for the rest of my life anyway...he will never change!